<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>堆叠层级</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        div{
            position: absolute;
            width: 200px;
            height: 200px;
        }

        .box1{
            background-color: pink;
            /* 取值是整数 默认是0 取值越大显示顺序越靠上 */
            z-index: 1;
        }
        .box2 {
            background-color: salmon;
            left: 50px;
            top: 50px;
            z-index: 2;
        }
    </style>
</head>
<body>
    <div class="box1">box1</div>
    <div class="box2">box2</div>
</body>
</html>